Ticket on BTW Day

Walking back to the office I caught this Seattle PD motorcycle cop pulling over a messenger. As best I can tell the cop was writing him up for take a left across a double yellow (?). The cyclist was on 3rd and took a left and hopped up on the curb on the opposite side of the road. I’m not really sure what the correct move is there or why it’s illegal – any ideas? Maybe it was a helmet ticket since he only had a hairnet on? Who knows – but Happy Bike to Work Day from the Seattle PD.